Squib Driver Circuit Protection for Airbag Faults
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Solution Overview
Problem
Airbag safety systems face challenges in protecting squib loop drivers from system faults such as short circuits, faulty energy reserves, and other failures, which can lead to improper airbag activation or damage to the drivers.
Innovation Solution
The implementation of a squib driver protection system that includes high-side and low-side drivers with a voltage regulator and protection circuits to detect faults and terminate deployment in case of system failures, reducing energy absorption during fault conditions and preventing damage to the drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If squib loop drivers are used to provide deployment function, then airbag activation is enabled, but drivers are vulnerable to damage from system faults such as short circuits and faulty energy reserves
Solution Approach 1:
The patent implements protection circuits that detect fault conditions (short circuits, faulty energy reserves) before they can damage the squib loop drivers. The circuits monitor system parameters and terminate deployment attempts when faults are detected, cushioning the drivers against harmful effects in advance.
Solution Approach 2:
The patent introduces protection circuits as intermediary components between the squib loop drivers and the potentially harmful system faults. These circuits act as mediators that detect faults and prevent them from reaching the drivers, isolating the vulnerable components from damage.
2Productivity
If deployment function is attempted until system fault occurs, then deployment capability is maintained, but energy absorption increases during fault conditions
Solution Approach 1:
The patent implements feedback mechanisms through protection circuits that continuously monitor system conditions during deployment attempts. When faults are detected, the feedback signal triggers immediate termination of the deployment function, preventing excessive energy absorption while maintaining deployment capability under normal conditions.
Solution Approach 2:
The patent makes the deployment function dynamic by enabling it to start and stop based on real-time system conditions. The protection circuits allow the system to adaptively terminate deployment when faults occur, optimizing energy usage while maintaining deployment capability when conditions are safe.
3Object-affected harmful factors
If protection circuits are added to detect faults, then driver protection is improved, but device complexity increases
Solution Approach 1:
The patent merges the protection circuit functionality with the existing squib loop driver circuitry. By integrating fault detection and protection functions into the same circuit architecture, the patent provides comprehensive driver protection while minimizing the increase in overall device complexity.
Solution Approach 2:
The protection circuits are designed to detect multiple types of faults (short circuits, faulty energy reserves, other system failures) using a unified approach. This multi-functional design provides comprehensive protection without requiring separate specialized circuits for each fault type, thereby limiting complexity growth.
Data Source
AI summary
A squib driver circuit for deployment of a deployable restraint in a vehicle. The safety restraint may have a minimum firing voltage. The voltage regulator may regulate the input voltage to be the minimum firing voltage at the input terminal. The squib driver circuit may be formed on a single chip. The squib driver circuit may include a high side driver and a low side driver. An input terminal for receiving an input voltage used to fire the deployable restraint. The high side driver may supply current from the input terminal to the deployable restraint. The low side driver may supply current from deployable restraint to the electrical ground.